• http://midatlantic.rootsweb.com/MD/washington/plats/map.html
  (Frederick County Plat Map prior to 1765)
  
• http://www.dnr.state.md.us/forests/healthreport/mdmap.html
  (Physiographic map of Maryland and its regions)
  
• http://www.erols.com/n3kev/mdroads/index.htm
  (About Maryland's roads)

• http://www.sos.state.md.us/sos/kids/html/fr.html
  (Just for Kids; about Frederick County with links to Monocacy information and history)
  
• http://www.mdarchives.state.md.us/msa/mdmanual/36loc/fr/html/fr.html
  (Background information about Frederick County government)
  
• http://www.mdarchives.state.md.us/msa/mdmanual/36loc/fr/html/frmu.html
  (Background information on Frederick County municipalities, population, etc.)
  
• http://www.visitfrederick.org/frmain.html-ssi
  (Links to information about historic sites, entertainment, etc. in Frederick County)
  
• http://www.fwp.net/fredericksistercities/
  (Information about Frederick's sister city in Germany — Schifferstadt!)
  
• http://www.CWPZoo.com/
  (Home of the Catoctin Wildlife Preserve and Zoo in Thurmont)
  
• http://www.setonshrine.org/
  (Emmitsburg Shrine of St. Elizabeth Ann Seton, America's first canonized saint)
  
• http://www.screensaves.com/grotto.htm
  (Information about the Grotto of Lourdes in Emmitsburg)
  
• http://www.civilwarmed.org/mission.htm
  (The National Museum of Civil War Medicine in Frederick)
  
• http://www.nps.gov/cato/
  (Catoctin Mountain Park near Thurmont)
  
• http://www.firehero.org
  (Information about the National Fallen Firefighters Monument in Emmitsburg)
  
• http://www.fwp.net/hsfc/#Top
  (The Historical Society of Frederick County in Frederick)
  

GENERAL

• http://midatlantic.rootsweb.com/MD/frederick/fredcoh.html
  (General history of the county through the French and Indian War)
  
• http://www.msmary.edu/seminary/html/history.htm
  (Information about the founding of Mt. Saint Mary's College in Emmitsburg)
  
• http://web.gmu.edu/bios/monocacy/index.htm
  (Information about the Monocacy River Valley, its history, and an environmental examination of its watershed)
  
• http://www.mdarchives.state.md.us/msa/mdmanual/01glance/html/chron.html
  (Time line of Maryland history)
  
• http://www.hood.edu/welcome_to_hood/index.cfm?pid=_culture.htm
  (General history of Frederick County by Hood College)
  

• http://www.zekes.com/~dspidell/famresearch/ulster.html
  (History of the Scots-Irish in this country with references to Frederick County)
  
• http://www.wam.umd.edu/~marystev/fclf/bchouse.html
  (The Beatty-Cramer house, believed to be the oldest in the county)
  
• http://www.nps.gov/mono/home.htm
  (Monocacy National Battlefield site)
  
• http://www.mdarchives.state.md.us/msa/speccol/photos/html/byerly.html
  (A short history of a Frederick resident around the time of the Civil War)
  
• http://www.mdarchives.state.md.us/msa/stagser/s1259/121/7590/html/0000.html
  (Maryland General Assembly meets in Frederick in 1861)
  
• http://www.ceresville.com/html/history.html
  (Ceresville mansion in Frederick County, built in 1888)
  
• http://www.armymedicine.army.mil/detrick/history/index.htm
  (A comprehensive history of Ft. Detrick, including some historical information about the Detrick family)
  

• http://www.nps.gov/fone/natlroad.htm
  (The National Road from Baltimore to the west)
  
• http://www.atawalk.com/20-10.html
  (Covered bridges in Frederick County)
  
• http://www.erols.com/n3kev/mdroads/index.htm
  (About Maryland's roads)
  
• http://bridge.skyline.net/history/
  (Community street bridge in Frederick)